Do you read their rules before joining their campaign? Almost it has: "Team project and bounty managers reserve the right to change the rules"
Even changing percentage of allocation for each bounty section. So, if they will distribute rewards afer doing KYC, I think it's ok. It's only problem with cheaters.
That you more carefully read the conditions for joining the campaign of generosity ICO. There are surely indicated specific conditions that can be changed, this is the order, terms and amount of payment of generosity and some others. Otherwise, why then draw up rules if any conditions can be further changed. Any lawyer will confirm to you that such a document will be illegal.
As for the announcement of the KYC check only after the end of the ICO, this is just a new form of fraud by the ICO team so that the bounty hunters do not pay out the earned tokens.